Exam code: 5090
Which row in the table below shows the correct products produced by anaerobic respiration in yeast and in animals?
| animals | yeast | ||
lactic acid | carbon dioxide | lactic acid | carbon dioxide | |
A | X | ✓ | X | X |
B | ✓ | X | X | ✓ |
C | X | ✓ | ✓ | X |
D | ✓ | ✓ | ✓ | X |
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During vigorous exercise, such as cycling uphill, lactic acid builds up in the muscles.
How is this lactic acid removed during recovery?
excretion of lactic acid by the kidneys
anaerobic respiration of lactic acid in the muscles
aerobic respiration of lactic acid in the liver
excretion of lactic acid by the lungs
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Why does anaerobic respiration of glucose release less energy in muscle cells than aerobic respiration?
Energy is lost in oxygen.
Energy remains trapped in the chemical bonds in the molecule lactic acid.
Energy remains trapped in the chemical bonds in the molecule ethanol.
Energy is lost in carbon dioxide.
1, 2 and 4
2 only
2 and 3
4 only
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The diagram below shows an experiment set up by a group of students to investigate respiration in yeast.
Which row of the table below correctly describes the contents of the flask after 20 hours?
| new compound | gas produced |
A | ethanol (alcohol) | oxygen |
B | ethanol (alcohol) | carbon dioxide |
C | lactic acid | oxygen |
D | lactic acid | carbon dioxide |
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The diagram below shows an experiment set up by a teacher to demonstrate how an investigation into anaerobic respiration in yeast cells can be carried out.
Predict what would happen to the coloured liquid in the glass tube.
Doesn’t move
Moves to the left
Moves rapidly to the right
Moves slowly to the right
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The list below shows four metabolic processes that can occur in living cells.
carbon dioxide + water → glucose + oxygen
glucose → lactic acid
glucose + oxygen → carbon dioxide + water
glucose → alcohol + carbon dioxide
Which row of the table correctly represents the processes that can occur in muscle cells and yeast cells.
| in muscles | in yeast |
A | 3 only | 1 & 4 |
B | 3 & 4 | 2 & 3 |
C | 2 only | 1, 3 & 4 |
D | 2 & 3 | 3 & 4 |
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